OSRAM introduces new LED prototypes for headlights
OSLON Black Flat (left) and OSRAM OSTAR Headlamp Pro (right) combine new technologies with new functionality and are perfectly matched to the requirements of headlight systems.
OSRAM Opto Semiconductors has developed two LED prototypes that combine new chip and package technologies to provide high light output (even at high currents), a uniform light pattern, thermal stability, and a particularly good contrast ratio.
The new LED prototypes - OSLON Black Flat and OSRAM OSTAR Headlamp Pro - are designed to provide headlight manufacturers with superior performance and optimized cost. The LEDs were designed in particular for headlights that adjust to changing ambient conditions, including high temperatures in the headlight itself.
"The two new prototypes combine new technologies with new functionality and are perfectly matched to the demanding automotive requirements of headlight systems," says Peter Knittl, OSRAM's director of Automotive LED. "This makes them particularly attractive for widespread use in all vehicle classes." The design uses OSRAM's new UX:3 chip technology, which excels at producing high light output even at high currents, and a ceramic converter, which provides a uniform light pattern. Additionally, the advanced package technology of the device produces a defined light/dark boundary in the light pattern, which provides a particularly good contrast ratio for simpler and improved optical designs. All these properties make the LEDs ideal for efficient use in headlights.
OSLON Black Flat is the latest addition to the OSLON Black Series and is equipped with a ceramic converter and a QFN package (Quad Flat No Leads). With a typical thermal resistance of 5 kW, it is 20% better than the traditional OSLON Black Series. The black package represents high stability because the coefficient of thermal expansion of the LED matches the coefficient of expansion of the metal core board. The flat-top, lens-free design is ideal for the close coupling needed for light-guide designs and maximizes the incoupling of light. The solder pad is identical to the other members of the OSLON family (OSLON Black, OSLON MX, and OSLON SX), which enables a wide range of light output from a largely identical board design. With a power draw of 2.3 W and an operating current of 700 mA, the new OSLON Black Flat achieves a typical luminous flux of 190 lm.
The OSRAM OSTAR Headlamp Pro is able to meet a wide range of requirements in terms of output and adaptability to ambient conditions. It offers a more uniform light pattern, better thermal stability (more useable warm lumens), and greater brightness than its OSTAR Headlamp predecessor. The new 20 x 20 mm high-flux LED is available in two- to five-chip configurations.
The new OSTAR LED offers headlight manufacturers better performance at lower costs. AFS (Adaptive Frontlighting System) functionality can now be achieved with chips that can be controlled individually or in series, allowing for chip matrix solutions. Typical luminous flux values are around 250 lm for a single chip (1-A operating current), equating to 1,250 lm for the five-chip version. The thermal resistance of the five-chip version has been reduced to 2.1 kW, which represents a 20% improvement over its predecessor.
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Osram Opto Semiconductors
Published February 2011
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